1 files changed, 83 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vpx_dsp/x86/sad4d_avx512.c b/media/libvpx/libvpx/vpx_dsp/x86/sad4d_avx512.c
new file mode 100644
index 0000000000..cfd23fedd9
--- /dev/null
+++ b/media/libvpx/libvpx/vpx_dsp/x86/sad4d_avx512.c
@@ -0,0 +1,83 @@
+/*
+ *  Copyright (c) 2017 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include <immintrin.h>  // AVX512
+#include "./vpx_dsp_rtcd.h"
+#include "vpx/vpx_integer.h"
+
+void vpx_sad64x64x4d_avx512(const uint8_t *src_ptr, int src_stride,
+                            const uint8_t *const ref_array[4], int ref_stride,
+                            uint32_t sad_array[4]) {
+  __m512i src_reg, ref0_reg, ref1_reg, ref2_reg, ref3_reg;
+  __m512i sum_ref0, sum_ref1, sum_ref2, sum_ref3;
+  __m512i sum_mlow, sum_mhigh;
+  int i;
+  const uint8_t *ref0, *ref1, *ref2, *ref3;
+
+  ref0 = ref_array[0];
+  ref1 = ref_array[1];
+  ref2 = ref_array[2];
+  ref3 = ref_array[3];
+  sum_ref0 = _mm512_set1_epi16(0);
+  sum_ref1 = _mm512_set1_epi16(0);
+  sum_ref2 = _mm512_set1_epi16(0);
+  sum_ref3 = _mm512_set1_epi16(0);
+  for (i = 0; i < 64; i++) {
+    // load src and all ref[]
+    src_reg = _mm512_loadu_si512((const __m512i *)src_ptr);
+    ref0_reg = _mm512_loadu_si512((const __m512i *)ref0);
+    ref1_reg = _mm512_loadu_si512((const __m512i *)ref1);
+    ref2_reg = _mm512_loadu_si512((const __m512i *)ref2);
+    ref3_reg = _mm512_loadu_si512((const __m512i *)ref3);
+    // sum of the absolute differences between every ref[] to src
+    ref0_reg = _mm512_sad_epu8(ref0_reg, src_reg);
+    ref1_reg = _mm512_sad_epu8(ref1_reg, src_reg);
+    ref2_reg = _mm512_sad_epu8(ref2_reg, src_reg);
+    ref3_reg = _mm512_sad_epu8(ref3_reg, src_reg);
+    // sum every ref[]
+    sum_ref0 = _mm512_add_epi32(sum_ref0, ref0_reg);
+    sum_ref1 = _mm512_add_epi32(sum_ref1, ref1_reg);
+    sum_ref2 = _mm512_add_epi32(sum_ref2, ref2_reg);
+    sum_ref3 = _mm512_add_epi32(sum_ref3, ref3_reg);
+
+    src_ptr += src_stride;
+    ref0 += ref_stride;
+    ref1 += ref_stride;
+    ref2 += ref_stride;
+    ref3 += ref_stride;
+  }
+  {
+    __m256i sum256;
+    __m128i sum128;
+    // in sum_ref[] the result is saved in the first 4 bytes
+    // the other 4 bytes are zeroed.
+    // sum_ref1 and sum_ref3 are shifted left by 4 bytes
+    sum_ref1 = _mm512_bslli_epi128(sum_ref1, 4);
+    sum_ref3 = _mm512_bslli_epi128(sum_ref3, 4);
+
+    // merge sum_ref0 and sum_ref1 also sum_ref2 and sum_ref3
+    sum_ref0 = _mm512_or_si512(sum_ref0, sum_ref1);
+    sum_ref2 = _mm512_or_si512(sum_ref2, sum_ref3);
+
+    // merge every 64 bit from each sum_ref[]
+    sum_mlow = _mm512_unpacklo_epi64(sum_ref0, sum_ref2);
+    sum_mhigh = _mm512_unpackhi_epi64(sum_ref0, sum_ref2);
+
+    // add the low 64 bit to the high 64 bit
+    sum_mlow = _mm512_add_epi32(sum_mlow, sum_mhigh);
+
+    // add the low 128 bit to the high 128 bit
+    sum256 = _mm256_add_epi32(_mm512_castsi512_si256(sum_mlow),
+                              _mm512_extracti32x8_epi32(sum_mlow, 1));
+    sum128 = _mm_add_epi32(_mm256_castsi256_si128(sum256),
+                           _mm256_extractf128_si256(sum256, 1));
+
+    _mm_storeu_si128((__m128i *)(sad_array), sum128);
+  }
+}